Engine air-to fuel ratio control system

(19)

(11)

EP 1 052 383 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	02.01.2003 Bulletin 2003/01

(43)	Date of publication A2:
	15.11.2000 Bulletin 2000/46

(21)	Application number: 00303953.4

(22)	Date of filing: 11.05.2000

(51)	International Patent Classification (IPC)⁷: F01N 3/20, G06F 17/50

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

11.05.1999 US 309779

(71)	Applicant: Ford Global Technologies, Inc.
	Dearborn, Michigan 48126 (US)

(72)	Inventors:
	Omara, Ahmed Abdelaziz Ann Arbor, Michigan 48108 (US) Hamburg, Douglas Ray Bloomfield Hills, Michigan 48301 (US) Bradley, John Edward Dearborn, Michigan 48120 (US)

(74)	Representative: Messulam, Alec Moses et al
	A. Messulam & Co. Ltd., 43-45 High Road Bushey Heath, Bushey, Herts WD23 1EE Bushey Heath, Bushey, Herts WD23 1EE (GB)

(54)	Engine air-to fuel ratio control system

(57) A three-way catalyst model (50) and a method for modeling the dynamic response of a three-way catalyst that divides the catalyst response into sub-regions (1-7). A sub-model (44) is constructed that represents each sub-region (1-7). Each sub-model (44) is assigned unique attributes at which the sub-model is activated. The attributes are based on the system parameters and states. The states may be either continuous or discrete and define a hybrid state space. A larger or smaller number of sub-regions (1-7) can be utilized based on the model's (50) use and the accuracy desired for the model (50).

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